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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0fafb0ba224f33aae02a5df18006516e6f31640095e048ea8b665b7d75512ad' 
  AND token = 'tqDcWNf+b4niJKyHe70hDa6dNaih+Qq9Ka6XsR7EpgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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