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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '551d70588fbcec8d99dff8275c182a8e7915b8293fdbec57e3c6f47b7d30e41d' 
  AND token = 'A//m1+2BzFTrPsuYFVXFkw5MaXn5lPeqFiy01HIW8Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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