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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c1a540ad5e84fde171173200fb313f80ed0def90f453958e0bee7277a77dbcd' 
  AND token = 'xC1807gqQCgTMvu5un3UlC87wO0bJefUih6s54ILV5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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