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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48028a8e04e8f4ee8ad22894d1fbb72d80d8e8b067fbb1adfa77bc2edb02af1' 
  AND token = 'VQYpNuTg9A5UM2FYehNcNYr0b1HK9Hx9Aep5qoJFoC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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