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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6bb61ccd529ab97af27e1e9f03c46fbf086d71958bb1268740c3ac360a0a9d5' 
  AND token = 'O4b2Im7WQ51baft6wcIWWcCMWPXy7MX2H9XJT2SPuhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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