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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41370b3dfaf6fa7d7c2eba69ec11fec7f543001c34737a566ed483713f290cdd' 
  AND token = 'yswlP6FmY2wSRzhBNdWQZTYcE1p40MilO93u3FMJpsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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