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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ef01c639bf5684019e62759d468d038d9e2421cb6796ccaa6da58d6b7b0cbf' 
  AND token = '5Rb9kg23+y+Qn3Qzdg83DfioeZRBak9lsRqWLSwX3vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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