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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824926070431f8ed62f403b305519657b9167715ab16a3a707794b5a266ffbe0' 
  AND token = 'ITyZBhDYgHi/OtKsIEHCe6JkO7oBikN0YaWUBmZeLkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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