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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '885994153db1c8547900ec1621fd8ba5f0263c151a87b0bc5fc92500ccb5085e' 
  AND token = '3OshMSLxRdS4hX9ktKAcCmVSM9MmkeljIBSaHMWeJLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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