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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd00fed45cfada0fcb2c1af83c1666968b9d09010a899337b7b61ecda64aa8d47' 
  AND token = 'tYVkeWF07JAEiV5vYkTGFDRQ1P3qUmnhitZkeKls1U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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