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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9760da9d360588a57a64848c21b4653cba89fecb267b25d9b38f157d499fd94f' 
  AND token = 'Fp93Cr8c5MR5H6Oi0eA9ynfOedXvgDRGvHwTengQjm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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