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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee4d9779616cb3e1dd52867a8aeda74eaf28eefc521da3714b58040d1dd7d07d' 
  AND token = 'J7+Bsc5lZiwldQXd/o4Uy996yeadRcGINd77LQyKQjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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