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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88537796917eaa17685c055910e98f76ce37bb6e9902997f663c8a4877acd319' 
  AND token = 'y2M9fBZqW6U4DM6B/kSAUxHU0+QPHprY5X1U2Azh7ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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