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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3a8e5a303c0d2043e32767debd5589aa6e0359258e1781c46699de59c9923c5' 
  AND token = 'spaZ2UST46Aqd5ufLJv86Fsl9hf84kAJ0c9aBeWpTic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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