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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94c1d0cd087b17a5eb5ce152a8a4223c8804fa6631fba8f355a05e5210aedfad' 
  AND token = 'alWCWFYBJ6alOPcj6ynxHFtsUJkf2hbONlIY8D4xpcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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