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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f642c1ce7ec979ab10d1e548c3b4632e71d81218ff9cd0a0bd5e4289da8a821' 
  AND token = 'mQUr00EkC8aYh1ZMSEMOzugMgg+iTBnEkUPKYoVmzC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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