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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a7cc3fcc5e0444a4cc6366ee5152555b1cd9556901f3c4601d60c5c339049d7' 
  AND token = 'Gn1dJb4UOSW6YWRlU/0BiGCRsx5nqYcA9E2WClD9dxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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