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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '492af747bf794a83198ae85fe1f9f4ae8629e48edf9b91248c3c605616ae662c' 
  AND token = '/uLsvIvH7ZA/WHz65P+C5rqcu3Af5nwyaCMtRvv/N2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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