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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56d5622c05753d2d1d55bccb67d9008532b631d5cd3e9085348c8c4d8dc6c3d4' 
  AND token = 'mUi5AMHd1AK7UlqRXx8/6rydyFJyuXeTpNP/Zld+fAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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