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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3cb0faaf0dac0553cade1d26b94e4bd0c3e6e22f0067b96a2de1a4d750a23a7' 
  AND token = 'IwPzpjAl4am+oYmQn8u6yuqrpVxOP5xPPwTahcO4XiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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