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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af72df0d6b30e1d2c8ee11def96349e657c003bba9ff7572c81da91b2b9b8d06' 
  AND token = 'zDNI1yajDHNOUwMSIH2+kkhXvHo8YYdoPNXKz42QKvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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