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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db6509d61f2b22b534f3efe17f00af3090c3e3b467ae8caf83d58338d0bff9a' 
  AND token = 'ZnoBU/0a7PR/DNtAU4/zy0GA/MQ8Qmj1r9ZHbWidmWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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