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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8864899aa183dfbd22ff1a93f4e7bf146defef10e103c8cb3a6c029cbfd2ffa' 
  AND token = '02WHE1I4sqVdVU6yMwWOzcO7x0WPqLLcZXDTFDMAfJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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