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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cb9ce04e78f92cdd0ea861bdc2204637418bd8aef9e9ba70537fd2808721b28' 
  AND token = 'TY/8smX2yxtSqUI5f4rzeB9ArWqNIWKnPo7QzFwY1dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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