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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94c08d3d90a174a24463463a025e773d7229e658a30b7d9009d600bd22e2571d' 
  AND token = 'iYLKsbZj4yqY9ilRR0sUlU5yUqTy6vQHwtjS9kO3x5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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