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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '969fd84f74c0faed4b4f576b6d4adaba3986ee334e58f9a7d327fb54dc5d9923' 
  AND token = 'KqoixKorrO6Qeg1iMXg+rNGcAkzLfqF9GqlfqoVtT0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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