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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a4bc841fa58b259b976abd85184d66e54953af91c6f642fb933cf93fd25e330' 
  AND token = 'mPsduG6T3Ii4CdGenT3L+lf9qx6fF63w2lLuvfgSRbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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