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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b00cf66c8f4e49dade0d7c8f99539afc0a910dcc932497e0a4ad4947f8439baf' 
  AND token = 'lhqXoIGuk/gD8oOg+b9JiM6ZPVh+MroVVgMjQ67uikg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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