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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3df62bd071598948818273c4e03dea4cce79170b7d51c02cacb813daae0603bb' 
  AND token = 'yBOcLKlHi1zOyrzx30ptg5UwO+C676mFIYQi/G10M6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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