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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23b3aeea391edfd3c73a203a764e2cae8ca1dfd899ae2a7bbf204d63d27aa551' 
  AND token = 'sWIMHh8wIOn/A+4rx9f5EUzhkTFWoXZFumvxmR5s5RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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