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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ce987109922272613e1969292a1550a48fec872b0e9e3eac64ef3f90b4ba08e' 
  AND token = '8PueDinRuX1JFRpMuCz1H66WYxbPHEs2DZPg2QaohFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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