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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3170bd15e6fe9c117cd80d15173ba7e5ab5826cca46eecc830851e9f4659fcc' 
  AND token = '1qQkCBgHaOStY5wqHZI75Fpi5hOHC/nYej5WG4en2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}