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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af6218449624a5595aacee0549a52843d1c36435c8cd7bc1ae13a814f06d313a' 
  AND token = 'IJoZZ9nTejlNJFJKGAKeh8pMs3IaMPkN2tiKlyCHc7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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