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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'accb0d9ed906dc22f99b3e795114d2283a5e9291e9532784bf02d005fdf0a50d' 
  AND token = '9N0KVoay6xSBbHx0xut2YBAMatrMVJYBMBNJXLZHqgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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