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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c8604e6f4392944b9dbd22e97abb7469c12bbcd55eead6deefbf56d8b3d14b9' 
  AND token = 'm0rsT4Pzcx4fH32BFcdG4x101YnxLRzb9wnDSapkxPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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