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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85d035f5507dceec68dc1d240544a2bb7030491be4fbe1a9a3c78c332eeae0ec' 
  AND token = 'RdpUw0WLP3pBHUki8x3iff538CUpXbQSsfDW/lZLfNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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