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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5992b9fc7c988919d5cfcec19af3cb4c69a6726b196f72d6c41552002eaf4651' 
  AND token = 'HnSi0S4IF+pAefNGhgZfazCX0EARGItDXjxlH6yokNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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