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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3c24055a083f964a500eb48a20c351612bc215834dc18131ca058b744f338a2' 
  AND token = 'J+27B4i2rmq1pMPr5g+vQgLYSJjiul1qNqgPEos6I7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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