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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dda927394d06479eae80331578442a36cb3eb6ff7406285eae328b48d0a6ebae' 
  AND token = 'yZr25r2PdcqfV6FslASi8kXog5vIC3NIkZAYqYzsi9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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