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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b2e779e8d6c8ee2e42ccab91f2bf4826a0a627b4e00fcc4a72d4e222b1363eb' 
  AND token = 'D8CmOfo95HBKC6EXVDnc6hVg+uR6j2kKGsgFp41hXME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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