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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acdd0a9e5372b5f3d994c09e7a8371e5594a7dd659e4a71ec94d58f0512aad8e' 
  AND token = 'A3P5y6gFSO5C0bb161+Lmla7roA5xGFUb3swJWdCnR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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