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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd17430da7093040cd5bf6c48938ccedda2845a5a115494c19983d440e180b0a1' 
  AND token = 'Eltv1dAgmp6ICg6d6lWbWdRkyC78LVl5BTintvXmyYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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