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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '615de6f1ed7b3d0322a75b1bfdc2958912c6558aad94dab64755afb37fac8b9e' 
  AND token = '+UA0n3gt3Jaq23Xy0/WgGbvfLHacg0HmD21QXUyKEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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