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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc9c6a0421903013f8dc5f1b255a2be7246d5def232105b943e708d38577f0a9' 
  AND token = 'FWX8/Uxq4tav3I+LuF5KCFET0eyIIoG8kzNL3C6C7XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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